349 
Mr. P. H. Gosse on the Insects of Jamaica. 
Shell rather tumid, ovate, elliptic, very inequilateral, with the 
beaks nearly terminal at the truncated anteal extremity. The 
posteal extremity rounded. An arched furrow runs from the 
beak to the margin at the anteal extremity. This furrow is 
smooth ; the space in front of it is terminated by about a dozen 
nearly perpendicular curved grooves, bounding a somewhat im- 
pressed, nearly smooth indistinct area. Between the arched 
groove and in front of the border of the lunule, all over the shell 
are fine curving divaricating furrows, forming a series of elegant 
angular markings. Towards the cardinal margin these furrows 
curve inwards, widen, and have thicker interspaces, so as to den- 
ticulate the borders of the lanceolate and nearly sm.ooth lunule. 
The ventral margin appears to have had smooth lips. The cast 
is smooth. Dimensions of the most perfect specimen, from beak 
to posterior angle, : central breadth y^^ : thickness y^^. 
“ This remarkable shell belongs to a group of Nuculce, of which 
there are few known species, either living or fossil. The oldest 
known members of the section occur in cretaceous strata : iVw- 
cula bivirgata, Sowerby, and ornatissima, D^Orbigny, both 
gault species, are examples. Still nearer the West Indian species 
is the Nucula Cobbolditje of the crag, a species which lived on in 
the Celtie region of Europe till the elevation of the sea-bed of 
the glacial epoch caused its extinction. Two living Nuculce re- 
present this group, viz. Nucula divaricata and Nucula castrensis, 
both described by Mr. Hinds in the ‘ Zoology of the Voyage of 
the Sulphur ’ ; the former was taken in twenty-four fathoms in 
the Chinese seas, and the latter dredged in seven fathoms, sand, 
at Sitka in North-West America.'’^ 
XXXIX. — On the Trisects of Jamaica. By Philip Henry Gosse, 
[Continued from p. 270.] 
63. Brentus (sp.). Taken on Bluefields Mountain early in 
June. 
64. Brentus (sp.). Small. Taken in the same locality a day 
or two after the former. 
65. Brentus (sp.). Intermediate in size between the preceding- 
two. Taken at the Hampstead Road near the end of June. 
66. PachncBus opalus). Numerous on the Hampstead 
Road in June, on low shrubs and herbaceous plants. 
67. Diaprepes Spengleri. I found this weevil in some abun- 
dance on the stunted prickly trees growing in the Pedro Plains, 
about the middle of June. I also found it plentiful in the island 
of St. Thomas, about a month later. 
